Checking Monitor Status

The purpose of the monitor result (mode 06) is to allow access to the results for on-board diagnostic monitoring tests of specific components/systems that are not continuously monitored. Examples are catalyst, evaporative emission (EVAP) and thermostat.

The monitor result allows the intelligent tester to display the monitor status, test value, minimum test value and maximum test limit. These data are displayed after the vehicle has been driven to run the monitor.

When the test value is not between the minimum test limit and maximum test limit, the ECM (PCM) interprets this as a malfunction. When the component is not malfunctioning, if the difference of the test value and test limit is very small, the component will malfunction in the near future. Perform the following instructions to view the monitor status. Although these instructions refer to the Lexus/Toyota diagnostic tester, it can be checked using a generic OBD II scan tool. Refer to your scan tool operator's manual for specific procedures.

1. PERFORM MONITOR DRIVE PATTERN 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch and intelligent tester ON.
   3. Clear the DTCs (see DTC CHECK / CLEAR  ).
   4. Run the vehicle in accordance with the applicable drive pattern described in READINESS MONITOR DRIVE PATTERN (see READINESS MONITOR DRIVE PATTERN  ). Do not turn the ignition switch OFF.
      NOTE: The test results will be lost if the ignition switch is turned OFF.
2. ACCESS MONITOR RESULT 
   1. Select from the intelligent tester menus: DIAGNOSIS / ENHANCED OBD II / MONITOR INFO and MONITOR RESULT. The monitor status appears after the component name.
      • INCMP: The component has not been monitored yet.
      • PASS: The component is functioning normally.
      • FAIL: The component is malfunctioning.
   2. Confirm that the component is either PASS or FAIL.
   3. Select the component and press ENTER. The accuracy test value appears if the monitor status is either PASS or FAIL.
3. CHECK COMPONENT STATUS 
   1. Compare the test value with the minimum test limit (MIN) and maximum test limit (MAX).
   2. If the test value is between the minimum test limit and maximum test limit, the component is functioning normally. If not, the component is malfunctioning. The test value is usually significantly higher or lower than the test limits. If the test value is on the borderline of the test limits, the component will malfunction in the near future.

      HINT:

      The monitor result might on rare occasions be PASS even if the malfunction indicator lamp (MIL) is illuminated. This indicates the system malfunctioned on a previous driving cycle. This might be caused by an intermittent problem.

4. MONITOR RESULT INFORMATION 

   If you use a generic scan tool, multiply the test value by the scaling value listed below.

   A/F Sensor Bank 1 

   DESCRIPTION CHART
   
   

   Monitor ID	Test ID	Scaling	Unit	Description
   $01	$8E	Multiply by 0.001	V	Response rate deterioration level for bank 1 sensor 1
   $01	$91	Multiply by 0.004	mA	A/F sensor current

   HO2S Bank 1 Sensor 2 

   DESCRIPTION CHART
   
   

   Monitor ID	Test ID	Scaling	Unit	Description
   $02	$07	Multiply by 0.001	V	Minimum sensor voltage
   $02	$08	Multiply by 0.001	V	Maximum sensor voltage
   $02	$8F	Multiply by 0.0003	Grams	Maximum oxygen storage capacity

   Catalyst - Bank 1 

   DESCRIPTION CHART
   
   

   Monitor ID	Test ID	Scaling	Unit	Description
   $21	$A9	Multiply by 0.0003	No dimension	Oxygen storage capacity of catalyst - Bank 1

   EVAP 

   DESCRIPTION CHART
   
   

   Monitor ID	Test ID	Scaling	Unit	Description
   $3D	$C9	Multiply by 0.001	kPa	Test value for small leak (P0456)
   $3D	$CA	Multiply by 0.001	kPa	Test value for gross leak (P0455)
   $3D	$CB	Multiply by 0.001	kPa	Test value for leak detection pump stuck OFF(P2401)
   $3D	$CD	Multiply by 0.001	kPa	Test value for leak detection pump stuck ON (P2402)
   $3D	$CE	Multiply by 0.001	kPa	Test value for vent valve stuck OFF (P2420)
   $3D	$CF	Multiply by 0.001	kPa	Test value for vent valve stuck ON (P2419)
   $3D	$D0	Multiply by 0.001	kPa	Test value for reference orifice low flow (P043E)
   $3D	$D1	Multiply by 0.001	kPa	Test value for reference orifice high flow (P043F)
   $3D	$D4	Multiply by 0.001	kPa	Test value for purge VSV stuck closed (P0441)
   $3D	$D5	Multiply by 0.001	kPa	Test value for purge VSV stuck open (P0441)
   $3D	$D7	Multiply by 0.001	kPa	Test value for purge flow insufficient (P0441)

   Rear Oxygen Sensor Heater 

   DESCRIPTION CHART
   
   

   Monitor ID	Test ID	Scaling	Unit	Description
   $42	$91	Multiply by 0.001	Ohm	Oxygen sensor heater resistance bank 1 sensor 2

   Secondary Air Injection (AIR) 

   DESCRIPTION CHART
   
   

   Monitor ID	Test ID	Scaling	Unit	Description
   $71	$E1	Multiply by 0.01	Gram per second	Test value of AIR Insufficient
   $71	$E2	Multiply by 0.01	kPa	Test value of AIR pump stuck ON
   $71	$E3	Multiply by 0.01	kPa	Test value of AIR pump stuck OFF
   $71	$E4	Multiply by 0.01	kPa	Test value of AIR control valve ON
   $71	$E5	Multiply by 0.01	kPa	Test value of AIR control valve OFF

   Misfire 

   DESCRIPTION CHART
   
   

   Monitor ID	Test ID	Scaling	Unit	Description
   $A1	$OB	Multiply by 1	Time	Total EWMA misfire count of all cylinders in last ten driving cycles EWMA: Exponential Weighted Moving Average
   $A1	$0C	Multiply by 1	Time	When Ignition switch Is ON, total misfire count of all cylinders In last driving cycle is displayed. While engine is running, total misfire count of all cylinders In current driving cycle Is displayed.
   $A2	$OB	Multiply by 1	Time	Total EWMA misfire count of cylinder 1 in last ten driving cycles
   $A2	$OC	Multiply by 1	Time	When Ignition switch Is ON, total misfire count of cylinder 1 in last driving cycle is displayed. While engine Is running, total misfire count of cylinder 1 in current driving cycle Is displayed.
   $A3	$OB	Multiply by 1	Time	Total EWMA misfire count of cylinder 2 In last ten driving cycles
   $A3	$OC	Multiply by 1	Time	When ignition switch is ON, total misfire count of cylinder 2 in last driving cycle Is displayed. While engine is running, total misfire count of cylinder 2 in current driving cycle Is displayed.
   $A4	$OB	Multiply by 1	Time	Total EWMA misfire count of cylinder 3 In last ten driving cycles
   $A4	$0C	Multiply by 1	Time	When Ignition switch is ON, total misfire count of cylinder 3 in last driving cycle is displayed. While engine is running, total misfire count of cylinder 3 in current driving cycle is displayed.
   $A5	$0B	Multiply by 1	Time	Total EWMA misfire count of cylinder 4 in last ten driving cycles
   $A5	$0C	Multiply by 1	Time	When ignition switch is ON, total misfire count of cylinder 4 in last driving cycle is displayed. While engine is running, total misfire count of cylinder 4 in current driving cycle is displayed.